And as before with "progressivism", what is "MAGA" really? I know what some of its outlooks are...being part a weird fascination with isolationist tendencies (if that means putting-down foreign entities considered ingrateful) yet also striving for unilateral action when the situation [e.g. "prestige"] warrants. But few of those prove consistent with any known philosophy that any professors studied, as it all seems more in line with the idea that: it's whatever Donald Trump decides to do at any one moment.
But I will say that, much like with "liberals", "conservatives" as a brand in the US are probably not as large as what many political scientists have told us, and they only incidentally latch themselves on to those respective and much older political movements, and they tend to fluctuate very often with time and whichever person is running for office.
So I have little doubt in my mind that, say, 15 years ago the "MAGA" people were the Rep. Ron Paul people, and before then the Pat Buchanan people, etc. Sort of like how everyone on the Left before Barack Obama was all goo-goo-gaga for Dennis Kucinich, if anyone remembers him...